Questions

Q:

What kind of crystalline solid is graphite?

A) Metallic B) Ionic
C) Molecular D) Covalent- network
 
Answer & Explanation Answer: D) Covalent- network

Explanation:

Graphite is a covalent-network type of crystalline solid.

 

There are two main categories of solids.

1. Crystalline solids and

2. Amorphous solids.

Crystalline solids are those in which the atoms, ions, or molecules that make up the solid exist in a regular, well-defined arrangement.

There are four types of crystalline solids :


Ionic solids :— Made up of positive and negative ions and held together by electrostatic attractions. They’re characterized by very high melting points and brittleness and are poor conductors in the solid state. An example of an ionic solid is table salt, NaCl.

Molecular solids :— Made up of atoms or molecules held together by London dispersion forces, dipole-dipole forces, or hydrogen bonds. Characterized by low melting points and flexibility and are poor conductors. An example of a molecular solid is sucrose.

Covalent-network (also called atomic) solids :— Made up of atoms connected by covalent bonds; the intermolecular forces are covalent bonds as well. Characterized as being very hard with very high melting points and being poor conductors. Examples of this type of solid are diamond and graphite, and the fullerenes. As you can see below, graphite has only 2-D hexagonal structure and therefore is not hard like diamond. The sheets of graphite are held together by only weak London forces!

Metallic solids :— Made up of metal atoms that are held together by metallic bonds. Characterized by high melting points, can range from soft and malleable to very hard, and are good conductors of electricity.

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Q:

One astronomical unit is the average distance between

A) Earth and the Sun B) Earth and the Moon
C) Jupiter and the Sun D) Pluto and the Sun
 
Answer & Explanation Answer: A) Earth and the Sun

Explanation:
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30 10275
Q:

Maximum age limit of President of India

A) 30 B) 35
C) 45 D) None of the above
 
Answer & Explanation Answer: D) None of the above

Explanation:

There is no maximum age limit for the President of India. Minimum age limit for president of India is 35 years.

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12 10274
Q:

A pure substance can only be

A) Compound B) an element
C) an element or a compound D) a heterogeneous mixture
 
Answer & Explanation Answer: C) an element or a compound

Explanation:
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17 10267
Q:

Which of the following is a scalar quantity

A) electric current B) electric field
C) Acceleration D) linear momentum
 
Answer & Explanation Answer: A) electric current

Explanation:

A Scalar quantity is a quantity that has only magnitude but no direction as like vector. 

Here in the given options, electric current is the only one which is scalar.

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21 10266
Q:

Which of the statements given below are correct?

 

A) In 2017 Pro Kabaddi League, Sandeep Narwal played for Bengaluru Bulls.

B) Alexander Norén won the Golf 2017 BMW PGA Championship.

C) In 2017, Michael Carrick captained the Premier League team Manchester City.

 

A) Only B B) B and C
C) A, B and C D) None of these
 
Answer & Explanation Answer: A) Only B

Explanation:
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Q:

Which 'Water Body' separates Andaman and Nicobar Islands ?

A) Eleventh Degree Channel B) Andaman Sea
C) Bay of Bengal D) Ten Degree Channel
 
Answer & Explanation Answer: D) Ten Degree Channel

Explanation:
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17 10250
Q:

" Kamarupa " is the old name of ______ state ?

A) Bihar B) Assam
C) Bengal D) Odisha
 
Answer & Explanation Answer: B) Assam

Explanation:

Alternately it is also called as Pragjyotisha before British rule.

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21 10241